LASER AND INFORMATION TECHNOLOGIES. MATHEMATICAL MODELING

Iterative approach to solve the inverse diffraction problem under sharp focusing conditions

N. S. Fidirko^a, S. G. Volotovsky<sup>ab

a</sup> Russia Samara National Research University
^b IPSI RAS – Branch of the FSRC «Crystallography and Photonics» RAS

Abstract: In this paper, we consider an iterative approach to solve the inverse diffraction problem under sharp focusing conditions. It is shown that using this approach we can obtain a complex distribution in the entrance of the focusing system that creates desired intensity distribution in the focal area. As a result of the iteration process we obtained a complex distribution of transverse components of the initial field that is focused in a light spot smaller than the diffraction limit.

Keywords: sharp focusing, iterative algorithm, diffraction limit.

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